Fire-tube steam-boiler.



No. 767,816. PATBN'IED AUG. 16, 1904. G. INGLIS.

FIRE TUBE STEAM BOILER.

APPLICATION FILED FEB. 17,1904. N0 MODEL. 3 SHEETSSHEET 1- W/TWESSESllVl/f/VTOR ms #776 [we/S,

PATENTED AUG. 16 1904.

G INGLIS. FIRE TUBE STEAM BOILER.

APPLICATION FILED FEB. 17, 1904.

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G.INGLIS. FIRE TUBE STEAM BOILER. APPLICATION FILED FEB. 17.1904.

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Patented August 16, 1904.

PATENT OFFICE.

GARDINER INGLIS, OF AIRDRIE, SCOTLAND.

FIRE-TUBE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 767,816, dated August16, 1904.

Application filed February 17, 1904. Serial No. 193,980. (No model.)

To all whom it may concern:

No. 5,939, dated the 14th day of March, 1903,

and in Germany, No. I. 7,332, dated the 1st of May, 1903.

This invention has reference to improvements in fire-tube steam-boilersof the marine and like type, and is particularly suitable where forcedor induced draft is used, and

has essentially for its objects to give the followingadvantages: first,improved combustion of furnace-gases and fuel; second, delivery of thegases from the furnaces to the firetubes of boiler at a uniformtemperature; third, when working with forced or induced draft to preventthe gases when they reach the tubes of being at such a temperature aswould injure or'cause damage to the tube ends; fourth, to preventclinker or other partially-burned fuel from being forced into the tubesand onto the tube-plate in such a manner as would cause seriousobstruction; fifth, to prevent cold air from reaching the tubeplate whenthe furnace-doors are open while charging the furnaces with fuel, and,sixth, to reduce the terminal temperature of the gases as they come tothe uptake.

My improvements essentially consist in com-. bining with theordinaryforward or primary furnace-fines and back combustion-chamber ofboiler a return or secondary combustionflue or wide chamber, so that thegaseous products of combustion shall be brought to a further chamberlocated at the front end of boiler and then pass through the fire-tubesto the uptake, the fire-tubes being secured at their ends to and carriedby the front and back end plates of boiler.

In order that my said invention and the manner of carrying same intopractice maybe properly understood, I have hereunto appended threesheets of explanatory drawings, in Which Figure 1 is a longitudinalvertical section of a steam-boiler of the marine type, showing theapplication of my improvements thereto, while Figs. 2 and 3 are endviews corresponding to Fig. 1 and as taken near the front and rear ends,respectively, of boiler.

Referring to the drawings, Within the shel A of the steam-boiler therewould be fitted at its lower part any desired number of corrugated orother flues B, carrying the fire-grates G. The usual combustion-chamberD would be fitted at the rear part of boiler.

By my improvements I lead a large flue or wide chamberE from the upperpart of the combustion-chamber D to the front end of shell A of boilerand communicating with a chamber or casing F, located at the front ofboiler. This casing F would preferably be lined with fire-brick F','butmay have instead a water-jacket chamber and be fitted with anyordinary-formed door or doors. The firetubes G would extend from thischamber F to the uptake H and be secured at their ends to the front andback end plates A A respectively, of shell A of boiler.

By this improved construction of steamboiler the gases from the furnacesC would pass through the primary flues B in what may be termed the lowerZone of the boiler into the combustion-chamber D, from whence thecombined gases would pass through the secondary combustion flue orchamber E to the front chamber F and from thence through the fire-tubesG to the uptake H in what may be termed the second zone of the furnace,while the upper steam-space of the boiler provided with the stay-rods Imaybe termed the upper zone.

I claim as my invention 1. A steam-boiler comprising a shell, end platestherefor, a flue open at one end, a combustion-chamber at right anglesthereto, both secured in an end plate, a second single flue of largecross-section substantially parallel with the first flue, a casing atone end of the boiler into which said second flue opens, a number offire-tubes secured in the end plates and open at one end to said casing.

2. A steam-boiler, comprising a shell, end plates therefor, a flue openat one end, an upright combustion-chamber within the shell, a secondsingle flue of large cross-section, parallel with the first, a casing atone end of the boiler to which said flue opens, a number of fire-tubessecured in the end plates and open to said casing.

3. A steam-boiler comprising a shell, end plates therefor, a flue forthe fire, a substantially parallel second flue, both secured at adjacentends in one end plate, a combustionchamber connecting their other ends,a number of fire-tubes secured in the end plates adjacent to andsurrounding a portion of said second flue, and a casing connecting saidtubes and said second flue substantially as described.

4. A steam-boiler, comprising a shell, end plates therefor, a flue forthe fire, a substantially parallel second flue, both secured at adjacentends in one end plate, a combustionchamber connecting their other ends,and entirely within the'shell, a number of fire-tubes secured in the endplates adjacent to and surrounding a portion of said second flue, and acasing connecting said tubes and said second flue, substantially asdescribed.

5. A steam-boiler, comprising a shell, end plates therefor, a pluralityof flues secured in one end plate, a flue E parallel thereto and alsosecured in said end plate, a combustionchamber connecting their otherends, a number of fire-tubes secured in the end plates, and a casingconnecting the flue E and fire-tubes.

6. A steam-boiler, comprising a shell, end plates therefor, a pluralityof flues secured in one end plate, a flue E parallel thereto and alsosecured in said end plate, a combustion-chamber entirely within saidshell, connecting their other ends, a number of lire-tubes secured inthe end plates, and a casing connecting the flue E and fire-tubes.

7 A steamboiler,having a cylindrical shell, end plates therefor, saidboiler having three zones, as follows: a lower zone and a flue thereinsecured at one end in an end plate, a second zone and a flue E and anumber of fire-tubes therein, the flue secured in one end plate and thetubes in both end plates, and a third zone comprising the steam-space, acasing connecting the flue E and tubes and a combustionchamberconnecting the flue of the lower zone with the flue E.

8. A steamboiler,having a cylindrical shell, end plates therefor, saidboiler having three zones as follows: a lower zone and a number of fluestherein, a second zone, a flue E and a number of fire-tubes therein, thetubes secured in both end plates, the flue secured in the same endplate, a combustion-chamber connecting the flues, and a casingconnecting the flue E and tubes, and a third zone comprising thesteam-space.

9. A steamboiler,having a cylindrical shell, end plates therefor, saidboiler having three zones, as follows: alower zone and aflue thereinsecured at one end in an end plate, a second zone and a flue E and anumber of fire tubes therein, the flue secured in one end plate and thetubes in both end plates, and a third zone comprising the steam-space, acasing outside the shell connecting the flue E and tubes and acombustion-chamber entirely within the shell connecting the flue of thelower zone withthe flue E.

10. A steam-boiler, having a cylindrical.

shell, end plates therefor, said boiler having three zones as follows: alower zone and a number of flues therein, a second zone, aflue E and anumber of fire-tubes therein, the tubes secured in both end'plates, theflues secured in the same end plate, a combustionchamber entirely withinthe shell, connecting the flues, and a casing outside the shellconnecting the flue E and tubes, and a third zone comprising thesteam-space.

11. A steam-boiler,comprising a cylindrical shell, end plates therefor,three fire-flues secured at one end in one of said plates, a flue E oflarger diameter above the fire-flues, secured in the same plate, acombustion-chamber connecting their other ends, anumber of fire-tubesclustered about the flue E and secured at each end in one of the endplates, and a casing connecting the flue E and tubes substantially asdescribed.

12. Asteam-boiler,comprisinga'cylindrical shell, end plates therefor,three fire-flues secured at one end in one of said plates, a flue E oflarger diameter above the fire-flues secured in the same plate, acombustion-cham ber entirely within the shell connecting their otherends, a number of fire-tubes clustered about the flue E and secured ateach end in one of the end plates and a casing outside the shellconnecting the flue E and tubes, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

GARDINER INGLIS. Witnesses:

R. O. THoMsoN, THOMAS B. BROWNLIE.

